What is dermatitis characterized by?

Dermatitis is primarily characterized by inflammation of the skin, which often results in symptoms such as itching, redness, and the formation of a rash. This condition commonly occurs as a reaction to various irritants or allergens, including chemicals found in pesticides. When the skin comes into contact with these substances, it can trigger an immune response, leading to the aforementioned symptoms. Understanding this is crucial for anyone working with pesticides, as it highlights the importance of using personal protective equipment and following safety guidelines to prevent skin exposure.

The other options refer to different concepts that do not pertain to dermatitis. Increased growth of plant cells and absence of moisture in plant tissues relate to plant health and physiology, while infection caused by bacteria points to a different health issue altogether, which does not specifically involve the skin's inflammatory response associated with dermatitis.